Unknown to an experimenter, the probability of a prototype etching procedure producing a defective part is p

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Unknown to an experimenter, the probability of a prototype etching procedure producing a defective part is p = 0.24. The experimenter examines 100 randomly selected parts and finds out whether or not each one is defective. What is the probability that the experimenter's point estimate of p is within 0.05 of the true value? How does this probability change if the experimenter examines 200 randomly selected parts?
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